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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 314d | Monte Carlo Masters 2003 | |
| 2 | 16y 342d | Hamburg Masters 2003 | |
| 3 | 17y 292d | Miami Masters 2004 | |
| 4 | 18y 84d | Indian Wells Masters 1991 | |
| 5 | 18y 114d | Canada Masters 2017 | |
| 6 | 18y 151d | Canada Masters 1990 | |
| 7 | 18y 154d | Rome Masters 1991 | |
| 8 | 18y 162d | Paris Masters 2005 | |
| 9 | 18y 165d | Cincinnati Masters 1990 | |
| 10 | 18y 173d | Indian Wells Masters 1990 | |
| 11 | 18y 176d | Miami Masters 2007 | |
| 12 | 18y 180d | Paris Masters 2021 | |
| 13 | 18y 193d | Miami Masters 1993 | |
| 14 | 18y 195d | Rome Masters 2020 | |
| 15 | 18y 201d | Miami Masters 2001 | |
| 16 | 18y 201d | Miami Masters 2005 | |
| 17 | 18y 216d | Miami Masters 1990 | |
| 18 | 18y 221d | Miami Masters 2019 | |
| 19 | 18y 227d | Stockholm Masters 1992 | |
| 20 | 18y 231d | Monte Carlo Masters 1993 |
